Something seems to have changed in the recent .17 versions, and each endpoint will now fail to correctly connect to both the large ducts (of any kind), and vanilla pipes. If you rotate or re-place each pipe and duct piece directly touching the endpoint, the connection to it will be established, however rotating or re-placing the endpoint still has no effect.

Thank for the report, I have a lot to do on this mod

Let me know if the new update have fix the problem

1379.046 Mods to disable:Fail when loading mods: Error while loading entity prototype "duct-underground" (pipe-to-ground): Invalid pipe connections specification for offset {0.5976562500, -1.5976562500}. The offset must be outside of the entity bounding-box
Modifications: Fluid Must Flow › Squeak Through › Looting Remnants

Mods to disable:
• FluidMustFlow
• Squeak Through
• LootingRemnants

This error /\ might be relationated...

That crash may be a specific case to be solved within squeakthrough itself, although it shouldn't really occur with normal collision models anyway...

New update seems to have no effect, they still fail to connect to neighbour pipes without rotating/placing said pipes...

Could u send me the savegame for test this? Pipes connection in Factorio is a very horrible

Now should be fixed